跨音速翼型风洞模型区侧壁抽气的影响

 引言 侧壁干扰是跨音速翼型风洞洞壁干扰的重要方面,减小它的方法主要是抽吸侧壁边界层。抽吸位置的选取有两种,在距模型前缘一定距离的侧壁处和模型区侧壁处。抽吸。适当的侧壁抽气可使模型区流场更接近于理想的二维流场,因此模型区侧壁抽气对空风洞流场的影响和对二维模型中央剖面压力分布的影响是最基本的问题,我们对它们进行了实验研究。

THE EFFECTS OF SUCTION AT SIDEWALL AROUND THE MODEL IN A TRANSONIC AIRFOIL WIND TUNNEL

In this paper the measured and calculated results of side-wall boundary layers of dry runs in Northwestern Polytechnical University 100 by 300 mm transonic wind tunnel with solid sidewall and with suctions at sidewall around model are discussed. The axial Mach number distribution in the dry runs, and the effects of sidewall suction against the chordwise and spanwise pressure distributions on a pressure testing model are also analised.It is found that suctions on the sidewall around the model can change the uniformity of the flow field in the dry runs; and by comparing with the solid sidewall, suctions on the sidewall around the model makes spanwise pressure distribution uniform, but change the chordwise pressure distribution on the central section.